US4564724A - Terminal interface connecting terminal unit having central office line interface to key telephone system - Google Patents

Terminal interface connecting terminal unit having central office line interface to key telephone system Download PDF

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Publication number
US4564724A
US4564724A US06/613,203 US61320384A US4564724A US 4564724 A US4564724 A US 4564724A US 61320384 A US61320384 A US 61320384A US 4564724 A US4564724 A US 4564724A
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United States
Prior art keywords
terminal
service
lines
unit
central office
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Expired - Lifetime
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US06/613,203
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English (en)
Inventor
Yasunobu Nakayama
Yasuji Sato
Shinichi Shibata
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Toshiba Corp
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Toshiba Corp
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Assigned to KABUSHIKI KAISHA TOSHIBA reassignment KABUSHIKI KAISHA TOSHIBA ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: NAKAYAMA, YASUNOBU, SATO, YASUJI, SHIBATA, SHINICHI
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems
    • H04M9/005—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems with subscriber controlled access to an exchange line
    • H04M9/007—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems with subscriber controlled access to an exchange line wherein the key telephone sets are star-connected to a central unit by a limited number of lines

Definitions

  • This invention relates to a terminal interface device provided to additionally connect such a terminal unit having a central office line interface as an answering telephone set, a facsimile equipment, a cordless telephone set or a modem, to a main unit of a key telephone system without further providing a current supply circuit for additional terminal units and ringing signal generators.
  • a key telephone system in which a plurality of key telephones are connected through a main unit to a plurality of central office lines (CO lines).
  • the main unit of such a key telephone system includes telephone interfaces connecting the key telephones to the CO lines, but does not include interfaces connecting between the system and a terminal unit equivalent to a standard telephone set having a central office line interface (CO line interface). For this reason, such a terminal unit as an answering telephone set, a facsimile equipment, a cordless telephone set or modem cannot be connected directly to the main unit of the key telephone system so as to commonly use the CO lines.
  • the answering telephone can answer the ringing CO line if the CO line is connected to the telephone but cannot answer other ringing CO lines which are not connected to this particular answering telephone. It is preferable that the answering telephone can exhibit its automatic answering function over all the CO lines connected to the key telephone system. However, according to the above method, the answering telephone cannot answer lines other than the particular one to which the telephone is connected and therefore this method is not preferable to provide an answering telephone as an option in the key telephone system.
  • the present invention comprises in-service detecting means connected to a plurality of CO lines leading to a main unit in a key telephone system and also connected to a terminal unit having a CO line interface, for detecting the in-service state of the respective lines, that is, whether the CO line is currently being used by the terminal unit and for sending an in-service signal indicative of the detected in-service state to the main unit of the system, and switching means controllably operated by a switching control signal generated from the main unit on the basis of the in-service signal and a signal indicative of the state of the CO lines in the main unit to connect one of the plural lines to the terminal unit.
  • the terminal unit having the CO interface includes an answering telephone set, a facsimile equipment, a cordless telephone set and a modem which are employed as an option for the key telephone system.
  • the terminal interface comprises in-service detecting means connected to a plurality of CO lines leading to the main unit of a key telephone system and also connected through first and second switching means to first and second terminal units having respective CO line interfaces, for detecting the in-service state of the CO lines to be used by the first and second terminal units and for sending an in-service signal indicative of the detected in-service state to the main unit of the system, and ringing detecting means connected to the respective lines through a relay whose contacts are closed when the power of the system is turned off, wherein said first switching means is automatically operated in response to a switching control signal generated from the main unit of the system on the basis of said in-service signal and a signal indicative of the state of the lines in the main unit and said second switching means is manually operated in response to a ringing detection of said ringing detecting means.
  • the terminal units having the CO interfaces can be assured in privacy state and selectively connected to the CO lines. Further, a terminal unit of the type requiring a ringing signal from a CO line to start its operation and terminal units having various functions can be employed in the terminal interface device of the invention. That is, with the terminal interface device of the invention, answering telephone sets, facsimile equipment or telephone sets for use in power failure can be connected to the main unit of the key telephone system.
  • the device of the invention can make effective use of the function of the terminal unit having the CO line interface, and thus will not require the main unit of the key telephone system to provide such circuits as a bell-signal generating circuit, a D.C. power supply circuit and a dial-signal receiving circuit.
  • FIG. 1 is a block diagram of a key telephone system connected to a terminal interface device according to an embodiment of the present invention
  • FIGS. 2 and 3 show block diagrams showing other embodiments of the device of the present invention.
  • FIG. 4 is a block diagram showing yet another embodiment of the invention wherein two of the device shown in FIG. 3 are arranged in tandem.
  • FIG. 1 there is shown a block diagram for explaining how a terminal interface device 36 according to an embodiment of the present invention is connected to a key telephone system 10. More specifically, the terminal interface device 36 connects optionally a terminal unit such as a telephone set 21 having a central office (CO) line interface, to the system 10 which comprises key telephone sets EKT l to EKT n and a main unit 1 for controlling the telephone sets.
  • a terminal unit such as a telephone set 21 having a central office (CO) line interface
  • CO central office
  • the unit 1 in the key telephone system 10 comprises line interfaces 11 and 12 leading to respective central office (CO) lines 2 and 3, telephone interfaces TI l to TI n connected to the respective key telephone sets EKT l to EKT n , a cross point array 13 for switching between the lines 2, 3 and key telephone sets EKT l to EKT n and between the telephone sets, and a main controller 14 for controlling the line interfaces 11, 12 telephone interfaces TI l to TI n , cross point array 13 and a switching control signal 38 in accordance with an in-service signal 37 to be described later.
  • CO central office
  • the CO lines 2 and 3 are connected to in-service detecting circuits 4 and 5, respectively.
  • the detectors 4 and 5 generate the in-service signal 37 and send it to the main unit 1 of the telephone system 10.
  • a switch 40 is provided between the in-service detectors 4, 5 and telephone set 21, a switch 40 is provided.
  • the switch 40 is of an automatic type which selectively connects the telephone 21 to the in-service detector 4 or 5 according to the switching control signal 38 supplied from the main unit 1.
  • the signal 38 is generated by the main controller 14 of the main unit 1 having a processor therein, and can act to control contacts 40a of the switch 40 differently depending on the function of the telephone 21 (or a facsimile and the like).
  • the main controller 14 of the main unit 1 detects a ringing sent to the CO line 2 or 3 and generates the switching control signal 38, causing the telephone 21 to connect to the in-service detector 4 or 5 so that the ringing signal from the CO line is directly inputted into the answering telephone 21 for activation.
  • the relay contacts 40a is normally kept at such positions as shown by a solid line in FIG. 1 so that, if the telephone 21 is hooked off, a signal indicative of the off-hook state is sent as the in-service signal 37 to the main unit 1.
  • the unit 1 receiving the signal 37 causes no change in the relay contacts 40a, whereas, if the line 2 is in service and the line 3 is not in service, the unit generates the switching control signal 38 and controls the relay contacts 40a so that the telephone 21 is connected to the line 3.
  • the telephone 21 is of a type requiring the idle line hunting function, on the other hand, a reception of the in-service signal 37 at the main unit 1 will cause no control of the switch 40 with the switching control signal 38 so that the telephone 21 will continue to be connected to the in-service detector 4.
  • the telephone 21 can be interruptively connected to the line 2.
  • the main unit 1 can detect that the telephone 21 is in service on the basis of the inputted in-service signal 37. Therefore, after having detected the in-service state, the main unit 1 can be arranged so as to inhibit any interruptive connection of the key telephone sets EKT l to EKT n to the CO line, whereby privacy state can be realized.
  • a section 35 enclosed by a chain-dotted line in FIG. 1 may be formed as an external device separated from the main unit 1 or may be formed on a printed circuit board in the unit 1.
  • FIG. 2 shows a block diagram of another embodiment of the present invention wherein the switch 40 is connected to the CO lines 2 and 3 so that the interconnection of an in-service detecting circuit 50 to the line 2 or 3 is switched according to the switching control signal 38.
  • the embodiment of FIG. 2 requires only one in-service detector, which result in that the number of necessary parts and the cost can be reduced.
  • FIG. 3 shows a further embodiment of the present invention wherein the CO lines 2 and 3 are connected respectively to ringing detection circuits 28 and 29 via relay contacts 26 and 27 which are closed when a power supply (not shown) of the main unit 1 is turned off.
  • the ringing detectors 28 and 29 are connected at their opposite sides with sounders 30 and 31 which generate ringing tones, respectively.
  • the ringing detectors 28, 29 and the sounders 30, 31 form ringing detecting means.
  • the in-service detector 4 is connected via manual switches 66 and 67 to a telephone set 62 having a CO line interface, while, the in-service detector 5 is connected via the manual switch 67 to the telephone set 62.
  • a telephone set 61 having a CO line interface is connected to the in-service detector 4 via relay contacts 64 and 65 controlled by the switching control signal 38, and also connected via the relay contact 65 to the in-service detector 5.
  • the relay contacts 64, 65 and switches 66, 67 are the automatic and manual types respectively.
  • Reference numeral 63 is a tandem terminal to be connected to a terminal (corresponding to numeral 68) of a terminal interface (not shown). That is, the telephone 61 is connected via the relay contacts 64 and 65 to the tandem terminal 63.
  • the relay contacts 26 and 27 are closed so that the ringing detectors 28 and 29 are connected respectively to the lines 2 and 3.
  • the relay contacts 64 and 65 are shifted to the illustrated positions. Therefore, the ringing signals from the lines 2 and 3 will cause the sounders 30 and 31 to produce ringing tones.
  • an operator for the telephone 61 can answer the ringing line 2 and an operator for the telephone 62 can answer the ringing line 2 or 3 by operating the manual switch 66 and 67.
  • the sounders 30 and 31 may be replaced by proper indicators or, in addition to the sounders, proper indicators may be provided.
  • the main unit 1 receiving the in-service signal 37 from the in-service detectors 4 and 5 enables the privacy conversation of the telephones 61 and 62.
  • the telephone 61 is of an automatic answering type
  • the telephone 61 can be selectively activated by a ringing signal of the line 2 or 3 from the central office under control of the switching control signal 38 to answer the ringing line.
  • the telephone 62 can be selectively connected to a desired one of the lines 2 and 3 for party calling or reception by switching the manual switches 66 and 67.
  • the telephones 61 and 62 may be interruptively connected to the line 2 or 3 in service, realizing the conference telephone.
  • the telephones 61 and 62 may be replaced with facsimile equipments, as necessary.
  • facsimile equipment 61 such a party calling or reception function as explained in FIGS. 1 and 2 can be provided for the facsimile equipment.
  • this equipment in the case of the facsimile equipment 62, this equipment can be selectively connected to the line 2 or 3 by means of the manual switches 66 and 67 so that the equipment can send data for both of the lines 2 and 3 or so that the equipment is can be connected to either one of the lines 2 and 3 for automatic data reception.
  • FIG. 4 there is shown yet another embodiment wherein two of the terminal interface devices shown in FIG. 3 are employed.
  • An additional terminal interface device 75 is connected to central office lines 72 and 73, and connected also via a tandem terminal 83 to the terminal 68 of the terminal interface device 36.
  • This allows the telephone 62 to be manually connected to the lines 2 and 3 as well as a telephone 82 to be manually connected to the lines 72 and 73.
  • a telephone 81 can be selectively connected to the line 72, 73, 2 or 3 by automatic switching means.
  • connection when two units, each having automatic answering function different from each other such as automatic answering telephone set and facsimile equipment, are to be connected, such connection is preferably made as follows. That is, the automatic answering telephone set is provided in place of the terminal unit 81 which is to be connected to CO lines automatically, and the facsimile equipment is provided in place of the terminal unit 82 which is to be connected to CO lines manually. In this case, the facsimile equipment is connected, for example, to the CO line 73.
  • the main unit 1 controls switching so as to connect the ringing line to the automatic answering telephone set for answering the ringing.
  • the facsimile equipment can have one dedicated CO line and the automatic answering telephone set can respond to ringing in the rest of the CO lines.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Facsimiles In General (AREA)
  • Telephonic Communication Services (AREA)
US06/613,203 1983-05-31 1984-05-23 Terminal interface connecting terminal unit having central office line interface to key telephone system Expired - Lifetime US4564724A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP58-095039 1983-05-31
JP58095039A JPS59221098A (ja) 1983-05-31 1983-05-31 ボタン電話装置の端末インタフエ−ス装置

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US4564724A true US4564724A (en) 1986-01-14

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JP (1) JPS59221098A (enrdf_load_html_response)
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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4660219A (en) * 1985-03-18 1987-04-21 Nitsuko Limited Extension ringing arrangement key telephone system
US4868865A (en) * 1987-02-27 1989-09-19 Kabushiki Kaisha Toshiba Terminal switching control apparatus
US4964154A (en) * 1988-01-14 1990-10-16 Ricoh Company, Ltd. Communication adapter device for use with a facsimile device combined with a computer
EP0416598A3 (en) * 1989-09-06 1991-12-27 Sharp Kabushiki Kaisha Facsimile apparatus
US5142567A (en) * 1988-05-09 1992-08-25 Canon Kabushiki Kaisha Communication apparatus having alternate message communication
EP0452864A3 (en) * 1990-04-18 1992-09-02 Sharp Kabushiki Kaisha Facsimile apparatus comprising cordless telephone set
US5191604A (en) * 1990-10-24 1993-03-02 Fuji Xerox Co., Ltd. Communication apparatus with private branch exchange for communicating with extension or external stations
US5222126A (en) * 1987-11-16 1993-06-22 Canon Kabushiki Kaisha Communication apparatus connected to other communication terminals
US5282241A (en) * 1990-03-26 1994-01-25 Kabushiki Kaisha Toshiba Modem pooling system
US5857010A (en) * 1994-06-07 1999-01-05 Canon Kabushiki Kaisha Power-failure resistant communication system

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61158292A (ja) * 1984-12-29 1986-07-17 Tamura Electric Works Ltd ボタン電話装置
JPS63217795A (ja) * 1987-03-05 1988-09-09 Matsushita Electric Ind Co Ltd ボタン電話装置
JP2540603Y2 (ja) * 1990-03-30 1997-07-09 日通工 株式会社 ボタン電話装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4028499A (en) * 1975-11-28 1977-06-07 Rca Corporation Universal/assigned night answering system for EPABX
US4381427A (en) * 1981-06-16 1983-04-26 Northern Telecom Limited Subscriber loop system for voice and data

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57212856A (en) * 1981-06-25 1982-12-27 Nippon Telegr & Teleph Corp <Ntt> Terminal adaptor system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4028499A (en) * 1975-11-28 1977-06-07 Rca Corporation Universal/assigned night answering system for EPABX
US4381427A (en) * 1981-06-16 1983-04-26 Northern Telecom Limited Subscriber loop system for voice and data

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4660219A (en) * 1985-03-18 1987-04-21 Nitsuko Limited Extension ringing arrangement key telephone system
US4868865A (en) * 1987-02-27 1989-09-19 Kabushiki Kaisha Toshiba Terminal switching control apparatus
US5222126A (en) * 1987-11-16 1993-06-22 Canon Kabushiki Kaisha Communication apparatus connected to other communication terminals
US4964154A (en) * 1988-01-14 1990-10-16 Ricoh Company, Ltd. Communication adapter device for use with a facsimile device combined with a computer
US5142567A (en) * 1988-05-09 1992-08-25 Canon Kabushiki Kaisha Communication apparatus having alternate message communication
EP0416598A3 (en) * 1989-09-06 1991-12-27 Sharp Kabushiki Kaisha Facsimile apparatus
US5282241A (en) * 1990-03-26 1994-01-25 Kabushiki Kaisha Toshiba Modem pooling system
EP0452864A3 (en) * 1990-04-18 1992-09-02 Sharp Kabushiki Kaisha Facsimile apparatus comprising cordless telephone set
US5479485A (en) * 1990-04-18 1995-12-26 Sharp Kabushiki Kaisha Facsimile apparatus comprising cordless telephone set
US5191604A (en) * 1990-10-24 1993-03-02 Fuji Xerox Co., Ltd. Communication apparatus with private branch exchange for communicating with extension or external stations
US5857010A (en) * 1994-06-07 1999-01-05 Canon Kabushiki Kaisha Power-failure resistant communication system

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CA1211239A (en) 1986-09-09
JPH0588599B2 (enrdf_load_html_response) 1993-12-22
JPS59221098A (ja) 1984-12-12

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